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22. Search for UHE neutrinos – in coincidence with LIGO GW150914 event – with the Pierre Auger ObservatoryLili Yang, 2016, objavljeni povzetek znanstvenega prispevka na konferenci Opis: The first gravitational wave transient GW150914 was observed by Advanced LIGO on September 14th, 2015 at 09:50:45 Universal Time. In addition to follow-up electromagnetic observations, the detection of neutrinos will probe deeply and more on the nature of astrophysical sources, especially in the ultra-high energy regime. Neutrinos in the EeV energy range were searched in data collected at the surface detector of the Pierre Auger Observatory within ± 500 s and 1 day after the GW150914 event. No neutrino candidates were found. Based on this non-observation, we derive the first and only one neutrino fluence upper limit at EeV energies for this event at 90% CL, and report constraints on existence of accretion disk around mergers. Ključne besede: gravitational waves, neutrinos, black hole physics Objavljeno v RUNG: 06.12.2016; Ogledov: 5224; Prenosov: 0 Gradivo ima več datotek! Več... |
23. GRB neutrino limits from AugerLili Yang, prispevek na konferenci brez natisa Opis: In this talk, I will talk about the searching for UHE neutrinos at Pierre Auger Observatory (PAO). Since no neutrino candidates is found so far. We have set the most stringent limits to point-like sources and Gamma-Ray-Bursts (GRB) of UHEν. I will also update the process of neutrino search results for PAO. Ključne besede: neutrinos, Pierre Auger Observatory, GRB Objavljeno v RUNG: 06.12.2016; Ogledov: 4713; Prenosov: 0 Gradivo ima več datotek! Več... |
24. Multi-messenger study of the Fermi BubblesLili Yang, predavanje na tuji univerzi Opis: The Fermi Bubbles have been imaged in sub-TeV gamma rays at Fermi-LAT, and, if their origin is hadronic, they might have been seen with low statistics in ∼0.1−1 PeV neutrinos at IceCube. I discuss the detectability of these objects at the new High Altitude Water Cherenkov (HAWC). HAWC will view the North Bubble for ∼2−3 hours a day, and will map its spectrum at 0.1-100 TeV. For the hard primary proton spectrum required to explain five events at IceCube, a high significance detection at HAWC will be achieved in less than 30 days. I will discuss how the combination of results at HAWC and IceCube will substantiate the hadronic model, or constrain its spectral parameters and how sensitive Cherenkov Telescope Array(CTA) is to the bubbles. Ključne besede: Fermi Bubbles, neutrinos, HAWC Objavljeno v RUNG: 06.12.2016; Ogledov: 4941; Prenosov: 0 Gradivo ima več datotek! Več... |
25. Ultrahigh energy neutrino follow-up of Gravitational Wave Event GW150914 with the Pierre Auger ObservatoryJaime Alvarez-Muňiz, Francisco Pedreira, Zlatka Zas, Pablo Pieroni, Marta Trini, Lili Yang, elaborat, predštudija, študija Ključne besede: UHE neutrinos, SD detector, Gravitational Waves Objavljeno v RUNG: 29.11.2016; Ogledov: 5376; Prenosov: 0 Gradivo ima več datotek! Več... |
26. Towards a Joint Analysis of Data from the IceCube Neutrino Telescope, the Pierre Auger Observatory and Telescope ArrayA. Christov, Andrej Filipčič, Ahmed Saleh, Samo Stanič, Darko Veberič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2016, objavljeni znanstveni prispevek na konferenci Ključne besede: ultra-high energy cosmic rays (UHECR), Pierre Auger Observatory, Telescope Array, very-high energy (VHE) neutrinos, IceCube Neutrino Telescope, joint data analysis Objavljeno v RUNG: 08.11.2016; Ogledov: 5262; Prenosov: 0 Gradivo ima več datotek! Več... |
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28. Search for a correlation between the UHECRs measured by the Pierre Auger Observatory and the Telescope Array and the neutrino candidate events from IceCubeAsen Christov, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Opis: We have conducted three searches for correlations between
ultra-high energy cosmic rays detected by the Telescope Array
and the Pierre Auger Observatory, and high-energy neutrino
candidate events from IceCube. Two cross-correlation analyses
with UHECRs are done: one with 39 cascades from the IceCube
‘high-energy starting events’ sample and the other with 16
high-energy ‘track events’. The angular separation between the
arrival directions of neutrinos and UHECRs is scanned over.
The same events are also used in a separate search using a
maximum likelihood approach, after the neutrino arrival
directions are stacked. To estimate the significance we assume
UHECR magnetic deflections to be inversely proportional to
their energy, with values 3◦, 6◦ and 9◦ at 100 EeV to allow for
the uncertainties on the magnetic field strength and UHECR
charge. A similar analysis is performed on stacked UHECR
arrival directions and the IceCube sample of through-going
muon track events which were optimized for neutrino point-
source searches. Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, Telescope Array, high-energy neutrinos, IceCube, correlation search Objavljeno v RUNG: 08.03.2016; Ogledov: 4969; Prenosov: 192 Celotno besedilo (1,11 MB) |
29. Update of the neutrino and photon limits from the Pierre Auger ObservatoryCarla Bleve, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2015, objavljeni znanstveni prispevek na konferenci Opis: Ultra-high energy neutrinos and photons, with energies above
1 EeV and 10 EeV respectively, can be detected with the Surface
Detector array (SD) of the Pierre Auger Observatory. Downward-
going neutrinos of all flavours interacting in the atmosphere
at zenith angles θ > 60◦, upward-going tau neutrinos (“Earth-
skimming”), as well as photons in the zenith range 30◦ − 60◦
can be identified through the broad time-structure of the
signals expected to be induced in the SD stations. An
additional signature for photon-induced air showers is the
steeper lateral distribution of secondary particles at ground
with respect to the nucleonic showers. Stringent limits are set
to the diffuse flux of ultra-high energy (UHE) neutrinos and
photons, using data collected between 2004 and mid-2013, under
the hypothesis of an E[sup]−2 spectrum for signal primaries. Ključne besede: ultra-high energy neutrinos, ultra-high energy photons, cosmic rays, elemental composition, Pierre Auger Observatory Objavljeno v RUNG: 03.03.2016; Ogledov: 4882; Prenosov: 231 Celotno besedilo (398,21 KB) |